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. 2021 Apr 14;11:8161. doi: 10.1038/s41598-021-87596-y

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Results of power spectral analysis of heart rate variability during DAY and NIGHT in W_NOKID group (dark bars) and W_KID group (white bars). The indices μ_RR (a), σ²_RR (b), and HF_RR (c) are shown. Results are presented as mean ± standard deviation. The symbol * indicates p < 0.05 DAY vs NIGHT. The symbol # indicates p < 0.05 W_KID vs W_NOKID.